PIT3712A
Service Bulletin Details
Public Details for: PIT3712A
This preliminary information communicates rear hvac blower operation and diagnostic.
- 2009 - 2008 - 2007 - 2006 - 2005 - 2004 - 2003 - 2002 -
Models from 2009
| 2009 CHEVROLET TRAILBLAZER |
| 2009 GMC ENVOY |
Models from 2008
| 2008 CHEVROLET TRAILBLAZER |
| 2008 GMC ENVOY |
Models from 2004
| 2004 CHEVROLET TRAILBLAZER EXT |
| 2004 GMC ENVOY XL |
Models from 2003
| 2003 CHEVROLET TRAILBLAZER EXT |
| 2003 GMC ENVOY XL |
Models from 2002
| 2002 CHEVROLET TRAILBLAZER EXT |
| 2002 GMC ENVOY XL |
Bulletin No.: PIT3712A Published date: 09/3/2019 Preliminary Information PIT3712A Rear Blower Motor Delay turn on for 3 Minutes DTCs B0145 B0428 B3531 Models Brand: Model: Model Years: VIN: from to Engine: Transmissions: Chevrolet Trailblazer EXT 2002 - 2009 All All All All GMC Envoy XL 2002 - 2009 All All All All GMC Envoy Denali 2002 - 2009 All All All All Supersession Statement This PI was superseded to update Model Years. Please discard PIT3712. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition / Concern During the rear actuator recalibration process, auxiliary HVAC blower operation is disabled. After approximately 3 minutes, if the auxiliary HVAC control module is unable to complete the recalibration process because of an auxiliary actuator and/or circuit malfunction, auxiliary HVAC blower operation will be enabled. In this case DTCs should set in the auxiliary HVAC control module, and the rear HVAC system will run in a default mode. If the auxiliary HVAC control module is unable to complete the recalibration process, it will attempt to recalibrate the rear actuators after every ignition key cycle until the process is complete. This would result in an auxiliary blower delay of approximately 3 minutes after each key cycle. Recommendations / Instructions 1. If there are any DTCs, please follow the appropriate diagnostic chart. 2. Inspect pin terminal tension at the Auxiliary HVAC control and at each Actuator. 3. Repair any terminals as necessary. Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. © 2019 General Motors. All Rights Reserved.